[Christerart]

Originally Posted by Georgeandkira

Excerpted from above: "...if you don't need a full tank because you're only doing local trips, you're carrying around all that extra weight of fuel which is less economical. "

True, but I like having a full tank so there's less air space for atmospheric moisture. The purge cycles of the EVAP system draw in air from the outside.

My long trips are less than 1/2 tank away. I let it go down during the outing but make sure it's full when I park it once home. This goes double when rain is predicted.

Hey, if my aversion to moisture in a fuel system is a throwback to steel tanks (which my '07 has) or is insignificant due to the alcohol in our petrol (alcohol attaches to water molecules and passes it with the petrol) then the joke's on me.

Agree - one of the first things I learned when started trucking in '84 was to always top off the tanks - exactly to stop condensation - as well as drain some fuel from each tanks into a gas container every now and then and check for water.